What size hole in what thickness of what material? For sheet metal,
there are "D" shaped chassis punches available. For anything thicker,
there's no real quick & easy way to make the hole. The classic method
is to simply drill holes to rough out the opening, then finish by
filing. The other approach is to make a full sized hole, then blank
part of it off with a half-round piece that's
glued/soldered/brazed/welded in place, as appropriate.
Roy
--- In 7x12minilathe@..., "hockeylove69" <hockeylove69@...>
wrote:
Hello all,
I have been lerking on the group for about a month now this is my
first
post. I have a HF 7X10 mini and a Grizzly Mini Mill and my main
interest is building model steam engines. However my brother came to
me
the other day wanting me to make a part that has a half round hole. I
have no idea how to do this. Is there a way to do this with either my
mill or lathe? Do I need to get a broach set? All the keyway broach
sets that I have seen make round holes with that square bit in the
middle. Thanks In Advance, I look forward to any help that may be
provided.
Rodney.
